Hello Mckuiper,
This "update" progress bar should be not from AutoCAD, but it should be come from AutoCAD Electrical. When you are rebuild your project, you may see such kind of "update" window.
This issue is always reproduciable in your PC once you installed AutoCAD Electrical or recently issue came out?
Could you please try to send a Customer Error Report when there is a crash caused by the "update" window once again? And if possible, please add your email address in that Customer Error Report dialog and some comments about how this issue reproduce in your PC.
Thank you very much.
Best regards,
Helen